If you gun is leaking where the needle enters the air cap section, this is most likely the culprit. Solvents get in and attack the seal.
Anest Iwata Needle Cartridge Packing 93940890 Needle valve packing set LPH-80
Anest Iwata Needle Cartridge Packing 93810620 valve set KIWAMI4 WIDER4 WS-400
Iwata Needle Cartridge Packing 93765610
IWATA Needle Cartridge Packing 93765610 LS400 LPH400 LPH200 LPH300 WS400 W400
